use crate::repl::command_tree::CommandTree;
use crate::repl::directive_actions::DirectiveAction;

pub fn directives_from_pass_names(pass_names: &Vec<String>) -> CommandTree {
  let passes_directives: Vec<CommandTree> = pass_names.iter()
    .map(|pass_name| {
      if pass_name == "parsing" {
        CommandTree::nonterm(pass_name, None, vec![
          CommandTree::nonterm_no_further_tab_completions("compact", None),
          CommandTree::nonterm_no_further_tab_completions("expanded", None),
          CommandTree::nonterm_no_further_tab_completions("trace", None),
        ])
      } else {
        CommandTree::nonterm_no_further_tab_completions(pass_name, None) 
      }
    })
    .collect();
  CommandTree::Top(get_list(&passes_directives, true))
}

fn get_list(passes_directives: &Vec<CommandTree>, include_help: bool) -> Vec<CommandTree> {
  use DirectiveAction::*;

  vec![
    CommandTree::terminal("exit", Some("exit the REPL"), vec![], QuitProgram),
    CommandTree::terminal("quit", Some("exit the REPL"), vec![], QuitProgram),
    CommandTree::terminal("help", Some("Print this help message"), if include_help { get_list(passes_directives, false) } else { vec![] }, Help),
    CommandTree::nonterm("debug",
      Some("Configure debug information"),
      vec![
        CommandTree::terminal("list-passes", Some("List all registered compiler passes"), vec![], ListPasses),
        CommandTree::terminal("show-immediate", None, passes_directives.clone(), ShowImmediate),
        CommandTree::terminal("show", Some("Show debug output for a specific pass"), passes_directives.clone(), Show),
        CommandTree::terminal("hide", Some("Hide debug output for a specific pass"), passes_directives.clone(), Hide),
        CommandTree::nonterm("total-time", None, vec![
          CommandTree::terminal("on", None, vec![], TotalTimeOn), 
          CommandTree::terminal("off", None, vec![], TotalTimeOff),
        ]),
        CommandTree::nonterm("stage-times", Some("Computation time per-stage"), vec![
          CommandTree::terminal("on", None, vec![], StageTimeOn),
          CommandTree::terminal("off", None, vec![], StageTimeOff),
        ])
      ]
    ),
    CommandTree::nonterm("lang",
      Some("switch between languages, or go directly to a langauge by name"),
      vec![
        CommandTree::nonterm_no_further_tab_completions("next", None),
        CommandTree::nonterm_no_further_tab_completions("prev", None),
        CommandTree::nonterm("go", None, vec![]),
      ]
    ),
    CommandTree::terminal("doc", Some("Get language-specific help for an item"), vec![], Doc),
  ]
}